Otwarty dostęp

Impact of longwall mining on slope stability – A case study

Phu Minh Vuong Nguyen
Phu Minh Vuong Nguyen
   | 27 lis 2022
Studia Geotechnica et Mechanica's Cover Image
O artykule
Poprzedni artykuł
Następny artykuł
Zacytuj
Article Category: Original Study
Data publikacji: 27 lis 2022
Zakres stron: 282 - 295
Otrzymano: 28 paź 2020
Przyjęty: 30 sie 2022
DOI: https://doi.org/10.2478/sgem-2022-0019
Słowa kluczowe
© 2022 Phu Minh Vuong Nguyen, published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1

Location of the Cao Son open pit coal mine [37].
Location of the Cao Son open pit coal mine [37].

Figure 2

Exploitation plan in the region of Cao Son and Khe Cham II–IV in the North–South cross section (A–A′).
Exploitation plan in the region of Cao Son and Khe Cham II–IV in the North–South cross section (A–A′).

Figure 3

Fragmental lithology and distribution of rock mass at the site study.
Fragmental lithology and distribution of rock mass at the site study.

Figure 4

Simplified 2D model geometry.
Simplified 2D model geometry.

Figure 5

Calculation variants due to pit slope stages and monitoring points on the slope surface.
Calculation variants due to pit slope stages and monitoring points on the slope surface.

Figure 6

Pit slope in 2025: (a) scheduled geometry, (b) FoS contours and slope failure surfaces.
Pit slope in 2025: (a) scheduled geometry, (b) FoS contours and slope failure surfaces.

Figure 7

Pit slope in 2030: (a) scheduled geometry, (b) FoS contours and slope failure surfaces.
Pit slope in 2030: (a) scheduled geometry, (b) FoS contours and slope failure surfaces.

Figure 8

Failure zone induced by UG operation by 2025: (a) scenario I, (b) scenario II, (c) scenario III
Failure zone induced by UG operation by 2025: (a) scenario I, (b) scenario II, (c) scenario III

Figure 9

FoS values for defferent scenarios of UG operation by 2025: (a) scenario I, (b) scenario II, (c) scenario III.
FoS values for defferent scenarios of UG operation by 2025: (a) scenario I, (b) scenario II, (c) scenario III.

Figure 10

Failure zone induced by UG operation by 2030: (a) scenario IV, (b) scenario V.
Failure zone induced by UG operation by 2030: (a) scenario IV, (b) scenario V.

Change of FoS value and size of the slope failure surface with different scenarios of UG operation by 2025.

Slope in 2025 FoS valueSize of the slope failure surface
Before UG After UG
Scenario I Scenario II Scenario III
Left slope wall 1.75–2.0 1.75–2.0Increased 1.5–1.75Increased 1.75–2.0-
Right slope wall >2.5 >2.5- >2.5- 2.0–2.25Increased

Mechanical properties of rock mass in the studied region [33].

Type of rock mass Bulk modulus K (GPa) Shear modulus G (GPa) Cohesion c (MPa) Fiction angle φ (°) Tensile strength σt (MPa) Density ρ (kg/m3)
Mudstone 2.31 1.54 1.87 30 1.34 2620
Claystone 2.23 1.34 2.05 26 1.14 2600
Anthracite 2.17 1.36 2.14 27 1.22 1500
Conglomerate 4.76 3.57 3.23 28 2.27 2510
Sandstone 3.91 2.46 3.56 28 1.96 2600

Strength parameters of the fault in the studied region [33].

Strength parameters Friction angle (°) Cohesion (kPa) Tensile strength (kPa)
Value 12–20 3.4–4.4 0

Hypotheses for calculating thickness of the caved zone.

Author, year Thickness of caved zone
Peng and Chiang, 1984 [38] (2–10)t
Bai et al., 1995 [39] 100t/(c1g+c2)
Mazurkiewicz et al., 1997 [40] t/(kr−1)
Heasley, 2004 [41] (10–18)t
Biliński, 2005 (simplified) [42] (nkst)/(0.05Rc0.5+0.02)
Wang et al., 2017 [43] (3–4)t
eISSN:
2083-831X
Język:
Angielski
Częstotliwość wydawania:
4 razy w roku
Dziedziny czasopisma:
Geosciences, other, Materials Sciences, Composites, Porous Materials, Physics, Mechanics and Fluid Dynamics
Kanał RSS czasopisma